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A glyoxylic acid method using cryostat sections to demonstrate catecholaminergic fibres of the central nervous system was modified to show the extent of the adrenergic innervation in rat brown adipose tissue. It revealed prominent interlacing fluorescent parenchymal fibres surrounding individual adipocytes. The density of this network of fine fibres was not evident using earlier techniques. The new method also confirmed the dense networks of adrenergic fibres associated with arterial vessels. Its specificity was verified by simultaneously performing radioenzymatic determinations of tissue catecholamine levels and histochemical studies of brown adipose tissue from normal and sympathectomized rats. Chemical sympathectomy with 6-hydroxydopamine resulted in a pronounced decrease in brown adipose tissue and heart catecholamine (noradrenalin and dopamine) levels. Significantly, in brown adipose tissue of sympathectomized animals no fluorescence could be detected in terminal nerves of either the parenchyma or those of vascular smooth muscles. Nevertheless, some intense fluorescence was seen in axon bundles. The findings suggest that catecholamines of the parenchymal innervation form a larger proportion of the total catecholamine content of brown adipose tissue than was previously believed, provide stronger support for direct control of the function of multilocular adipocytes, and also confirm unpublished data reporting considerable dopamine content in brown adipose tissue.
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